date format fix

app/agents/timeline_agent.py

@@ -94,10 +94,20 @@ async def delete_timeline(timeline_id: str) -> str:
 
 
 @tool
-async def list_timelines_today() -> str:
-    """List all timeline events (milestones) whose date falls on today (UTC)."""
-    now = datetime.now(tz=timezone.utc)
-    start_ms = int(datetime(now.year, now.month, now.day, tzinfo=timezone.utc).timestamp() * 1000)
+async def list_timelines_today(user_timezone: str = "UTC") -> str:
+    """List all timeline events (milestones) whose date falls on today.
+
+    user_timezone: IANA timezone name (e.g. 'Europe/Rome', 'America/New_York').
+    Always pass the user's timezone so 'today' is computed in their local time.
+    """
+    try:
+        from zoneinfo import ZoneInfo
+        tz = ZoneInfo(user_timezone or "UTC")
+    except Exception:
+        tz = timezone.utc
+    now_local = datetime.now(tz=tz)
+    start_dt = datetime(now_local.year, now_local.month, now_local.day, tzinfo=tz)
+    start_ms = int(start_dt.timestamp() * 1000)
     end_ms = start_ms + 86_400_000 - 1
     result = await execute_on_client(
         action="select",